2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/kmod.h>
75 #include <linux/namei.h>
76 #include <linux/buffer_head.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include <linux/writeback.h> /* for inode_lock, oddly enough.. */
80 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
81 #include <net/netlink.h>
82 #include <net/genetlink.h>
85 #include <asm/uaccess.h>
87 #define __DQUOT_PARANOIA
90 * There are two quota SMP locks. dq_list_lock protects all lists with quotas
91 * and quota formats and also dqstats structure containing statistics about the
92 * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures
93 * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
94 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
95 * in inode_add_bytes() and inode_sub_bytes().
97 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock
99 * Note that some things (eg. sb pointer, type, id) doesn't change during
100 * the life of the dquot structure and so needn't to be protected by a lock
102 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
103 * operation is just reading pointers from inode (or not using them at all) the
104 * read lock is enough. If pointers are altered function must hold write lock
105 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
106 * for altering the flag i_mutex is also needed). If operation is holding
107 * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
109 * This locking assures that:
110 * a) update/access to dquot pointers in inode is serialized
111 * b) everyone is guarded against invalidate_dquots()
113 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
114 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
115 * Currently dquot is locked only when it is being read to memory (or space for
116 * it is being allocated) on the first dqget() and when it is being released on
117 * the last dqput(). The allocation and release oparations are serialized by
118 * the dq_lock and by checking the use count in dquot_release(). Write
119 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
120 * spinlock to internal buffers before writing.
122 * Lock ordering (including related VFS locks) is the following:
123 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
125 * i_mutex on quota files is special (it's below dqio_mutex)
128 static DEFINE_SPINLOCK(dq_list_lock);
129 DEFINE_SPINLOCK(dq_data_lock);
131 static char *quotatypes[] = INITQFNAMES;
132 static struct quota_format_type *quota_formats; /* List of registered formats */
133 static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
135 /* SLAB cache for dquot structures */
136 static struct kmem_cache *dquot_cachep;
138 int register_quota_format(struct quota_format_type *fmt)
140 spin_lock(&dq_list_lock);
141 fmt->qf_next = quota_formats;
143 spin_unlock(&dq_list_lock);
147 void unregister_quota_format(struct quota_format_type *fmt)
149 struct quota_format_type **actqf;
151 spin_lock(&dq_list_lock);
152 for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
154 *actqf = (*actqf)->qf_next;
155 spin_unlock(&dq_list_lock);
158 static struct quota_format_type *find_quota_format(int id)
160 struct quota_format_type *actqf;
162 spin_lock(&dq_list_lock);
163 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
164 if (!actqf || !try_module_get(actqf->qf_owner)) {
167 spin_unlock(&dq_list_lock);
169 for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
170 if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
173 spin_lock(&dq_list_lock);
174 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
175 if (actqf && !try_module_get(actqf->qf_owner))
178 spin_unlock(&dq_list_lock);
182 static void put_quota_format(struct quota_format_type *fmt)
184 module_put(fmt->qf_owner);
188 * Dquot List Management:
189 * The quota code uses three lists for dquot management: the inuse_list,
190 * free_dquots, and dquot_hash[] array. A single dquot structure may be
191 * on all three lists, depending on its current state.
193 * All dquots are placed to the end of inuse_list when first created, and this
194 * list is used for invalidate operation, which must look at every dquot.
196 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
197 * and this list is searched whenever we need an available dquot. Dquots are
198 * removed from the list as soon as they are used again, and
199 * dqstats.free_dquots gives the number of dquots on the list. When
200 * dquot is invalidated it's completely released from memory.
202 * Dquots with a specific identity (device, type and id) are placed on
203 * one of the dquot_hash[] hash chains. The provides an efficient search
204 * mechanism to locate a specific dquot.
207 static LIST_HEAD(inuse_list);
208 static LIST_HEAD(free_dquots);
209 static unsigned int dq_hash_bits, dq_hash_mask;
210 static struct hlist_head *dquot_hash;
212 struct dqstats dqstats;
214 static void dqput(struct dquot *dquot);
216 static inline unsigned int
217 hashfn(const struct super_block *sb, unsigned int id, int type)
221 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
222 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
226 * Following list functions expect dq_list_lock to be held
228 static inline void insert_dquot_hash(struct dquot *dquot)
230 struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
231 hlist_add_head(&dquot->dq_hash, head);
234 static inline void remove_dquot_hash(struct dquot *dquot)
236 hlist_del_init(&dquot->dq_hash);
239 static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
241 struct hlist_node *node;
244 hlist_for_each (node, dquot_hash+hashent) {
245 dquot = hlist_entry(node, struct dquot, dq_hash);
246 if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
252 /* Add a dquot to the tail of the free list */
253 static inline void put_dquot_last(struct dquot *dquot)
255 list_add_tail(&dquot->dq_free, &free_dquots);
256 dqstats.free_dquots++;
259 static inline void remove_free_dquot(struct dquot *dquot)
261 if (list_empty(&dquot->dq_free))
263 list_del_init(&dquot->dq_free);
264 dqstats.free_dquots--;
267 static inline void put_inuse(struct dquot *dquot)
269 /* We add to the back of inuse list so we don't have to restart
270 * when traversing this list and we block */
271 list_add_tail(&dquot->dq_inuse, &inuse_list);
272 dqstats.allocated_dquots++;
275 static inline void remove_inuse(struct dquot *dquot)
277 dqstats.allocated_dquots--;
278 list_del(&dquot->dq_inuse);
281 * End of list functions needing dq_list_lock
284 static void wait_on_dquot(struct dquot *dquot)
286 mutex_lock(&dquot->dq_lock);
287 mutex_unlock(&dquot->dq_lock);
290 static inline int dquot_dirty(struct dquot *dquot)
292 return test_bit(DQ_MOD_B, &dquot->dq_flags);
295 static inline int mark_dquot_dirty(struct dquot *dquot)
297 return dquot->dq_sb->dq_op->mark_dirty(dquot);
300 int dquot_mark_dquot_dirty(struct dquot *dquot)
302 spin_lock(&dq_list_lock);
303 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
304 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
305 info[dquot->dq_type].dqi_dirty_list);
306 spin_unlock(&dq_list_lock);
310 /* This function needs dq_list_lock */
311 static inline int clear_dquot_dirty(struct dquot *dquot)
313 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
315 list_del_init(&dquot->dq_dirty);
319 void mark_info_dirty(struct super_block *sb, int type)
321 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
323 EXPORT_SYMBOL(mark_info_dirty);
326 * Read dquot from disk and alloc space for it
329 int dquot_acquire(struct dquot *dquot)
331 int ret = 0, ret2 = 0;
332 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
334 mutex_lock(&dquot->dq_lock);
335 mutex_lock(&dqopt->dqio_mutex);
336 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
337 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
340 set_bit(DQ_READ_B, &dquot->dq_flags);
341 /* Instantiate dquot if needed */
342 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
343 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
344 /* Write the info if needed */
345 if (info_dirty(&dqopt->info[dquot->dq_type]))
346 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
354 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
356 mutex_unlock(&dqopt->dqio_mutex);
357 mutex_unlock(&dquot->dq_lock);
362 * Write dquot to disk
364 int dquot_commit(struct dquot *dquot)
366 int ret = 0, ret2 = 0;
367 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
369 mutex_lock(&dqopt->dqio_mutex);
370 spin_lock(&dq_list_lock);
371 if (!clear_dquot_dirty(dquot)) {
372 spin_unlock(&dq_list_lock);
375 spin_unlock(&dq_list_lock);
376 /* Inactive dquot can be only if there was error during read/init
377 * => we have better not writing it */
378 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
379 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
380 if (info_dirty(&dqopt->info[dquot->dq_type]))
381 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
386 mutex_unlock(&dqopt->dqio_mutex);
393 int dquot_release(struct dquot *dquot)
395 int ret = 0, ret2 = 0;
396 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
398 mutex_lock(&dquot->dq_lock);
399 /* Check whether we are not racing with some other dqget() */
400 if (atomic_read(&dquot->dq_count) > 1)
402 mutex_lock(&dqopt->dqio_mutex);
403 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
404 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
406 if (info_dirty(&dqopt->info[dquot->dq_type]))
407 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
411 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
412 mutex_unlock(&dqopt->dqio_mutex);
414 mutex_unlock(&dquot->dq_lock);
418 static void dquot_destroy(struct dquot *dquot)
420 kmem_cache_free(dquot_cachep, dquot);
423 static inline void do_destroy_dquot(struct dquot *dquot)
425 dquot->dq_sb->dq_op->destroy_dquot(dquot);
428 /* Invalidate all dquots on the list. Note that this function is called after
429 * quota is disabled and pointers from inodes removed so there cannot be new
430 * quota users. There can still be some users of quotas due to inodes being
431 * just deleted or pruned by prune_icache() (those are not attached to any
432 * list). We have to wait for such users.
434 static void invalidate_dquots(struct super_block *sb, int type)
436 struct dquot *dquot, *tmp;
439 spin_lock(&dq_list_lock);
440 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
441 if (dquot->dq_sb != sb)
443 if (dquot->dq_type != type)
445 /* Wait for dquot users */
446 if (atomic_read(&dquot->dq_count)) {
449 atomic_inc(&dquot->dq_count);
450 prepare_to_wait(&dquot->dq_wait_unused, &wait,
451 TASK_UNINTERRUPTIBLE);
452 spin_unlock(&dq_list_lock);
453 /* Once dqput() wakes us up, we know it's time to free
455 * IMPORTANT: we rely on the fact that there is always
456 * at most one process waiting for dquot to free.
457 * Otherwise dq_count would be > 1 and we would never
460 if (atomic_read(&dquot->dq_count) > 1)
462 finish_wait(&dquot->dq_wait_unused, &wait);
464 /* At this moment dquot() need not exist (it could be
465 * reclaimed by prune_dqcache(). Hence we must
470 * Quota now has no users and it has been written on last
473 remove_dquot_hash(dquot);
474 remove_free_dquot(dquot);
476 do_destroy_dquot(dquot);
478 spin_unlock(&dq_list_lock);
481 int vfs_quota_sync(struct super_block *sb, int type)
483 struct list_head *dirty;
485 struct quota_info *dqopt = sb_dqopt(sb);
488 mutex_lock(&dqopt->dqonoff_mutex);
489 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
490 if (type != -1 && cnt != type)
492 if (!sb_has_quota_active(sb, cnt))
494 spin_lock(&dq_list_lock);
495 dirty = &dqopt->info[cnt].dqi_dirty_list;
496 while (!list_empty(dirty)) {
497 dquot = list_first_entry(dirty, struct dquot, dq_dirty);
498 /* Dirty and inactive can be only bad dquot... */
499 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
500 clear_dquot_dirty(dquot);
503 /* Now we have active dquot from which someone is
504 * holding reference so we can safely just increase
506 atomic_inc(&dquot->dq_count);
508 spin_unlock(&dq_list_lock);
509 sb->dq_op->write_dquot(dquot);
511 spin_lock(&dq_list_lock);
513 spin_unlock(&dq_list_lock);
516 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
517 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
518 && info_dirty(&dqopt->info[cnt]))
519 sb->dq_op->write_info(sb, cnt);
520 spin_lock(&dq_list_lock);
522 spin_unlock(&dq_list_lock);
523 mutex_unlock(&dqopt->dqonoff_mutex);
528 /* Free unused dquots from cache */
529 static void prune_dqcache(int count)
531 struct list_head *head;
534 head = free_dquots.prev;
535 while (head != &free_dquots && count) {
536 dquot = list_entry(head, struct dquot, dq_free);
537 remove_dquot_hash(dquot);
538 remove_free_dquot(dquot);
540 do_destroy_dquot(dquot);
542 head = free_dquots.prev;
547 * This is called from kswapd when we think we need some
551 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
554 spin_lock(&dq_list_lock);
556 spin_unlock(&dq_list_lock);
558 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
561 static struct shrinker dqcache_shrinker = {
562 .shrink = shrink_dqcache_memory,
563 .seeks = DEFAULT_SEEKS,
567 * Put reference to dquot
568 * NOTE: If you change this function please check whether dqput_blocks() works right...
569 * MUST be called with either dqptr_sem or dqonoff_mutex held
571 static void dqput(struct dquot *dquot)
577 #ifdef __DQUOT_PARANOIA
578 if (!atomic_read(&dquot->dq_count)) {
579 printk("VFS: dqput: trying to free free dquot\n");
580 printk("VFS: device %s, dquot of %s %d\n",
582 quotatypes[dquot->dq_type],
588 spin_lock(&dq_list_lock);
590 spin_unlock(&dq_list_lock);
592 spin_lock(&dq_list_lock);
593 if (atomic_read(&dquot->dq_count) > 1) {
594 /* We have more than one user... nothing to do */
595 atomic_dec(&dquot->dq_count);
596 /* Releasing dquot during quotaoff phase? */
597 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
598 atomic_read(&dquot->dq_count) == 1)
599 wake_up(&dquot->dq_wait_unused);
600 spin_unlock(&dq_list_lock);
603 /* Need to release dquot? */
604 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
605 spin_unlock(&dq_list_lock);
606 /* Commit dquot before releasing */
607 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
609 printk(KERN_ERR "VFS: cannot write quota structure on "
610 "device %s (error %d). Quota may get out of "
611 "sync!\n", dquot->dq_sb->s_id, ret);
613 * We clear dirty bit anyway, so that we avoid
616 spin_lock(&dq_list_lock);
617 clear_dquot_dirty(dquot);
618 spin_unlock(&dq_list_lock);
622 /* Clear flag in case dquot was inactive (something bad happened) */
623 clear_dquot_dirty(dquot);
624 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
625 spin_unlock(&dq_list_lock);
626 dquot->dq_sb->dq_op->release_dquot(dquot);
629 atomic_dec(&dquot->dq_count);
630 #ifdef __DQUOT_PARANOIA
632 BUG_ON(!list_empty(&dquot->dq_free));
634 put_dquot_last(dquot);
635 spin_unlock(&dq_list_lock);
638 static struct dquot *dquot_alloc(struct super_block *sb, int type)
640 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
643 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
647 dquot = sb->dq_op->alloc_dquot(sb, type);
651 mutex_init(&dquot->dq_lock);
652 INIT_LIST_HEAD(&dquot->dq_free);
653 INIT_LIST_HEAD(&dquot->dq_inuse);
654 INIT_HLIST_NODE(&dquot->dq_hash);
655 INIT_LIST_HEAD(&dquot->dq_dirty);
656 init_waitqueue_head(&dquot->dq_wait_unused);
658 dquot->dq_type = type;
659 atomic_set(&dquot->dq_count, 1);
665 * Get reference to dquot
666 * MUST be called with either dqptr_sem or dqonoff_mutex held
668 static struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
670 unsigned int hashent = hashfn(sb, id, type);
671 struct dquot *dquot, *empty = NODQUOT;
673 if (!sb_has_quota_active(sb, type))
676 spin_lock(&dq_list_lock);
677 if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
678 if (empty == NODQUOT) {
679 spin_unlock(&dq_list_lock);
680 if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
681 schedule(); /* Try to wait for a moment... */
686 /* all dquots go on the inuse_list */
688 /* hash it first so it can be found */
689 insert_dquot_hash(dquot);
691 spin_unlock(&dq_list_lock);
693 if (!atomic_read(&dquot->dq_count))
694 remove_free_dquot(dquot);
695 atomic_inc(&dquot->dq_count);
696 dqstats.cache_hits++;
698 spin_unlock(&dq_list_lock);
700 do_destroy_dquot(empty);
702 /* Wait for dq_lock - after this we know that either dquot_release() is already
703 * finished or it will be canceled due to dq_count > 1 test */
704 wait_on_dquot(dquot);
705 /* Read the dquot and instantiate it (everything done only if needed) */
706 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
710 #ifdef __DQUOT_PARANOIA
711 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
717 static int dqinit_needed(struct inode *inode, int type)
721 if (IS_NOQUOTA(inode))
724 return inode->i_dquot[type] == NODQUOT;
725 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
726 if (inode->i_dquot[cnt] == NODQUOT)
731 /* This routine is guarded by dqonoff_mutex mutex */
732 static void add_dquot_ref(struct super_block *sb, int type)
734 struct inode *inode, *old_inode = NULL;
736 spin_lock(&inode_lock);
737 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
738 if (!atomic_read(&inode->i_writecount))
740 if (!dqinit_needed(inode, type))
742 if (inode->i_state & (I_FREEING|I_WILL_FREE))
746 spin_unlock(&inode_lock);
749 sb->dq_op->initialize(inode, type);
750 /* We hold a reference to 'inode' so it couldn't have been
751 * removed from s_inodes list while we dropped the inode_lock.
752 * We cannot iput the inode now as we can be holding the last
753 * reference and we cannot iput it under inode_lock. So we
754 * keep the reference and iput it later. */
756 spin_lock(&inode_lock);
758 spin_unlock(&inode_lock);
762 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
763 static inline int dqput_blocks(struct dquot *dquot)
765 if (atomic_read(&dquot->dq_count) <= 1)
770 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
771 /* We can't race with anybody because we hold dqptr_sem for writing... */
772 static int remove_inode_dquot_ref(struct inode *inode, int type,
773 struct list_head *tofree_head)
775 struct dquot *dquot = inode->i_dquot[type];
777 inode->i_dquot[type] = NODQUOT;
778 if (dquot != NODQUOT) {
779 if (dqput_blocks(dquot)) {
780 #ifdef __DQUOT_PARANOIA
781 if (atomic_read(&dquot->dq_count) != 1)
782 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
784 spin_lock(&dq_list_lock);
785 list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
786 spin_unlock(&dq_list_lock);
790 dqput(dquot); /* We have guaranteed we won't block */
795 /* Free list of dquots - called from inode.c */
796 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
797 static void put_dquot_list(struct list_head *tofree_head)
799 struct list_head *act_head;
802 act_head = tofree_head->next;
803 /* So now we have dquots on the list... Just free them */
804 while (act_head != tofree_head) {
805 dquot = list_entry(act_head, struct dquot, dq_free);
806 act_head = act_head->next;
807 list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
812 static void remove_dquot_ref(struct super_block *sb, int type,
813 struct list_head *tofree_head)
817 spin_lock(&inode_lock);
818 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
819 if (!IS_NOQUOTA(inode))
820 remove_inode_dquot_ref(inode, type, tofree_head);
822 spin_unlock(&inode_lock);
825 /* Gather all references from inodes and drop them */
826 static void drop_dquot_ref(struct super_block *sb, int type)
828 LIST_HEAD(tofree_head);
831 down_write(&sb_dqopt(sb)->dqptr_sem);
832 remove_dquot_ref(sb, type, &tofree_head);
833 up_write(&sb_dqopt(sb)->dqptr_sem);
834 put_dquot_list(&tofree_head);
838 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
840 dquot->dq_dqb.dqb_curinodes += number;
843 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
845 dquot->dq_dqb.dqb_curspace += number;
848 static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
850 if (dquot->dq_dqb.dqb_curinodes > number)
851 dquot->dq_dqb.dqb_curinodes -= number;
853 dquot->dq_dqb.dqb_curinodes = 0;
854 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
855 dquot->dq_dqb.dqb_itime = (time_t) 0;
856 clear_bit(DQ_INODES_B, &dquot->dq_flags);
859 static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
861 if (dquot->dq_dqb.dqb_curspace > number)
862 dquot->dq_dqb.dqb_curspace -= number;
864 dquot->dq_dqb.dqb_curspace = 0;
865 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
866 dquot->dq_dqb.dqb_btime = (time_t) 0;
867 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
870 static int warning_issued(struct dquot *dquot, const int warntype)
872 int flag = (warntype == QUOTA_NL_BHARDWARN ||
873 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
874 ((warntype == QUOTA_NL_IHARDWARN ||
875 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
879 return test_and_set_bit(flag, &dquot->dq_flags);
882 #ifdef CONFIG_PRINT_QUOTA_WARNING
883 static int flag_print_warnings = 1;
885 static inline int need_print_warning(struct dquot *dquot)
887 if (!flag_print_warnings)
890 switch (dquot->dq_type) {
892 return current_fsuid() == dquot->dq_id;
894 return in_group_p(dquot->dq_id);
899 /* Print warning to user which exceeded quota */
900 static void print_warning(struct dquot *dquot, const int warntype)
903 struct tty_struct *tty;
905 if (warntype == QUOTA_NL_IHARDBELOW ||
906 warntype == QUOTA_NL_ISOFTBELOW ||
907 warntype == QUOTA_NL_BHARDBELOW ||
908 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
911 tty = get_current_tty();
914 tty_write_message(tty, dquot->dq_sb->s_id);
915 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
916 tty_write_message(tty, ": warning, ");
918 tty_write_message(tty, ": write failed, ");
919 tty_write_message(tty, quotatypes[dquot->dq_type]);
921 case QUOTA_NL_IHARDWARN:
922 msg = " file limit reached.\r\n";
924 case QUOTA_NL_ISOFTLONGWARN:
925 msg = " file quota exceeded too long.\r\n";
927 case QUOTA_NL_ISOFTWARN:
928 msg = " file quota exceeded.\r\n";
930 case QUOTA_NL_BHARDWARN:
931 msg = " block limit reached.\r\n";
933 case QUOTA_NL_BSOFTLONGWARN:
934 msg = " block quota exceeded too long.\r\n";
936 case QUOTA_NL_BSOFTWARN:
937 msg = " block quota exceeded.\r\n";
940 tty_write_message(tty, msg);
945 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
947 /* Netlink family structure for quota */
948 static struct genl_family quota_genl_family = {
949 .id = GENL_ID_GENERATE,
953 .maxattr = QUOTA_NL_A_MAX,
956 /* Send warning to userspace about user which exceeded quota */
957 static void send_warning(const struct dquot *dquot, const char warntype)
963 int msg_size = 4 * nla_total_size(sizeof(u32)) +
964 2 * nla_total_size(sizeof(u64));
966 /* We have to allocate using GFP_NOFS as we are called from a
967 * filesystem performing write and thus further recursion into
968 * the fs to free some data could cause deadlocks. */
969 skb = genlmsg_new(msg_size, GFP_NOFS);
972 "VFS: Not enough memory to send quota warning.\n");
975 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
976 "a_genl_family, 0, QUOTA_NL_C_WARNING);
979 "VFS: Cannot store netlink header in quota warning.\n");
982 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
985 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
988 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
991 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
992 MAJOR(dquot->dq_sb->s_dev));
995 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
996 MINOR(dquot->dq_sb->s_dev));
999 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
1002 genlmsg_end(skb, msg_head);
1004 ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
1005 if (ret < 0 && ret != -ESRCH)
1007 "VFS: Failed to send notification message: %d\n", ret);
1010 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
1016 static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
1020 for (i = 0; i < MAXQUOTAS; i++)
1021 if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
1022 !warning_issued(dquots[i], warntype[i])) {
1023 #ifdef CONFIG_PRINT_QUOTA_WARNING
1024 print_warning(dquots[i], warntype[i]);
1026 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1027 send_warning(dquots[i], warntype[i]);
1032 static inline char ignore_hardlimit(struct dquot *dquot)
1034 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1036 return capable(CAP_SYS_RESOURCE) &&
1037 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH));
1040 /* needs dq_data_lock */
1041 static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
1043 *warntype = QUOTA_NL_NOWARN;
1044 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1045 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1048 if (dquot->dq_dqb.dqb_ihardlimit &&
1049 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
1050 !ignore_hardlimit(dquot)) {
1051 *warntype = QUOTA_NL_IHARDWARN;
1055 if (dquot->dq_dqb.dqb_isoftlimit &&
1056 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1057 dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
1058 !ignore_hardlimit(dquot)) {
1059 *warntype = QUOTA_NL_ISOFTLONGWARN;
1063 if (dquot->dq_dqb.dqb_isoftlimit &&
1064 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1065 dquot->dq_dqb.dqb_itime == 0) {
1066 *warntype = QUOTA_NL_ISOFTWARN;
1067 dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1073 /* needs dq_data_lock */
1074 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1076 *warntype = QUOTA_NL_NOWARN;
1077 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1078 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1081 if (dquot->dq_dqb.dqb_bhardlimit &&
1082 dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bhardlimit &&
1083 !ignore_hardlimit(dquot)) {
1085 *warntype = QUOTA_NL_BHARDWARN;
1089 if (dquot->dq_dqb.dqb_bsoftlimit &&
1090 dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
1091 dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
1092 !ignore_hardlimit(dquot)) {
1094 *warntype = QUOTA_NL_BSOFTLONGWARN;
1098 if (dquot->dq_dqb.dqb_bsoftlimit &&
1099 dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
1100 dquot->dq_dqb.dqb_btime == 0) {
1102 *warntype = QUOTA_NL_BSOFTWARN;
1103 dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
1107 * We don't allow preallocation to exceed softlimit so exceeding will
1116 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1118 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1119 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1120 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1121 return QUOTA_NL_NOWARN;
1123 if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit)
1124 return QUOTA_NL_ISOFTBELOW;
1125 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1126 dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit)
1127 return QUOTA_NL_IHARDBELOW;
1128 return QUOTA_NL_NOWARN;
1131 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1133 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1134 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1135 return QUOTA_NL_NOWARN;
1137 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1138 return QUOTA_NL_BSOFTBELOW;
1139 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1140 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1141 return QUOTA_NL_BHARDBELOW;
1142 return QUOTA_NL_NOWARN;
1145 * Initialize quota pointers in inode
1146 * Transaction must be started at entry
1148 int dquot_initialize(struct inode *inode, int type)
1150 unsigned int id = 0;
1153 /* First test before acquiring mutex - solves deadlocks when we
1154 * re-enter the quota code and are already holding the mutex */
1155 if (IS_NOQUOTA(inode))
1157 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1158 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1159 if (IS_NOQUOTA(inode))
1161 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1162 if (type != -1 && cnt != type)
1164 if (inode->i_dquot[cnt] == NODQUOT) {
1173 inode->i_dquot[cnt] = dqget(inode->i_sb, id, cnt);
1177 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1182 * Release all quotas referenced by inode
1183 * Transaction must be started at an entry
1185 int dquot_drop(struct inode *inode)
1189 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1190 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1191 if (inode->i_dquot[cnt] != NODQUOT) {
1192 dqput(inode->i_dquot[cnt]);
1193 inode->i_dquot[cnt] = NODQUOT;
1196 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1200 /* Wrapper to remove references to quota structures from inode */
1201 void vfs_dq_drop(struct inode *inode)
1203 /* Here we can get arbitrary inode from clear_inode() so we have
1204 * to be careful. OTOH we don't need locking as quota operations
1205 * are allowed to change only at mount time */
1206 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
1207 && inode->i_sb->dq_op->drop) {
1209 /* Test before calling to rule out calls from proc and such
1210 * where we are not allowed to block. Note that this is
1211 * actually reliable test even without the lock - the caller
1212 * must assure that nobody can come after the DQUOT_DROP and
1213 * add quota pointers back anyway */
1214 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1215 if (inode->i_dquot[cnt] != NODQUOT)
1217 if (cnt < MAXQUOTAS)
1218 inode->i_sb->dq_op->drop(inode);
1223 * Following four functions update i_blocks+i_bytes fields and
1224 * quota information (together with appropriate checks)
1225 * NOTE: We absolutely rely on the fact that caller dirties
1226 * the inode (usually macros in quotaops.h care about this) and
1227 * holds a handle for the current transaction so that dquot write and
1228 * inode write go into the same transaction.
1232 * This operation can block, but only after everything is updated
1234 int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
1236 int cnt, ret = NO_QUOTA;
1237 char warntype[MAXQUOTAS];
1239 /* First test before acquiring mutex - solves deadlocks when we
1240 * re-enter the quota code and are already holding the mutex */
1241 if (IS_NOQUOTA(inode)) {
1243 inode_add_bytes(inode, number);
1246 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1247 warntype[cnt] = QUOTA_NL_NOWARN;
1249 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1250 if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */
1251 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1254 spin_lock(&dq_data_lock);
1255 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1256 if (inode->i_dquot[cnt] == NODQUOT)
1258 if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA)
1261 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1262 if (inode->i_dquot[cnt] == NODQUOT)
1264 dquot_incr_space(inode->i_dquot[cnt], number);
1266 inode_add_bytes(inode, number);
1269 spin_unlock(&dq_data_lock);
1270 if (ret == QUOTA_OK)
1271 /* Dirtify all the dquots - this can block when journalling */
1272 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1273 if (inode->i_dquot[cnt])
1274 mark_dquot_dirty(inode->i_dquot[cnt]);
1275 flush_warnings(inode->i_dquot, warntype);
1276 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1281 * This operation can block, but only after everything is updated
1283 int dquot_alloc_inode(const struct inode *inode, qsize_t number)
1285 int cnt, ret = NO_QUOTA;
1286 char warntype[MAXQUOTAS];
1288 /* First test before acquiring mutex - solves deadlocks when we
1289 * re-enter the quota code and are already holding the mutex */
1290 if (IS_NOQUOTA(inode))
1292 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1293 warntype[cnt] = QUOTA_NL_NOWARN;
1294 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1295 if (IS_NOQUOTA(inode)) {
1296 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1299 spin_lock(&dq_data_lock);
1300 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1301 if (inode->i_dquot[cnt] == NODQUOT)
1303 if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
1307 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1308 if (inode->i_dquot[cnt] == NODQUOT)
1310 dquot_incr_inodes(inode->i_dquot[cnt], number);
1314 spin_unlock(&dq_data_lock);
1315 if (ret == QUOTA_OK)
1316 /* Dirtify all the dquots - this can block when journalling */
1317 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1318 if (inode->i_dquot[cnt])
1319 mark_dquot_dirty(inode->i_dquot[cnt]);
1320 flush_warnings(inode->i_dquot, warntype);
1321 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1326 * This operation can block, but only after everything is updated
1328 int dquot_free_space(struct inode *inode, qsize_t number)
1331 char warntype[MAXQUOTAS];
1333 /* First test before acquiring mutex - solves deadlocks when we
1334 * re-enter the quota code and are already holding the mutex */
1335 if (IS_NOQUOTA(inode)) {
1337 inode_sub_bytes(inode, number);
1341 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1342 /* Now recheck reliably when holding dqptr_sem */
1343 if (IS_NOQUOTA(inode)) {
1344 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1347 spin_lock(&dq_data_lock);
1348 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1349 if (inode->i_dquot[cnt] == NODQUOT)
1351 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1352 dquot_decr_space(inode->i_dquot[cnt], number);
1354 inode_sub_bytes(inode, number);
1355 spin_unlock(&dq_data_lock);
1356 /* Dirtify all the dquots - this can block when journalling */
1357 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1358 if (inode->i_dquot[cnt])
1359 mark_dquot_dirty(inode->i_dquot[cnt]);
1360 flush_warnings(inode->i_dquot, warntype);
1361 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1366 * This operation can block, but only after everything is updated
1368 int dquot_free_inode(const struct inode *inode, qsize_t number)
1371 char warntype[MAXQUOTAS];
1373 /* First test before acquiring mutex - solves deadlocks when we
1374 * re-enter the quota code and are already holding the mutex */
1375 if (IS_NOQUOTA(inode))
1378 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1379 /* Now recheck reliably when holding dqptr_sem */
1380 if (IS_NOQUOTA(inode)) {
1381 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1384 spin_lock(&dq_data_lock);
1385 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1386 if (inode->i_dquot[cnt] == NODQUOT)
1388 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
1389 dquot_decr_inodes(inode->i_dquot[cnt], number);
1391 spin_unlock(&dq_data_lock);
1392 /* Dirtify all the dquots - this can block when journalling */
1393 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1394 if (inode->i_dquot[cnt])
1395 mark_dquot_dirty(inode->i_dquot[cnt]);
1396 flush_warnings(inode->i_dquot, warntype);
1397 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1402 * Transfer the number of inode and blocks from one diskquota to an other.
1404 * This operation can block, but only after everything is updated
1405 * A transaction must be started when entering this function.
1407 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1410 struct dquot *transfer_from[MAXQUOTAS];
1411 struct dquot *transfer_to[MAXQUOTAS];
1412 int cnt, ret = NO_QUOTA, chuid = (iattr->ia_valid & ATTR_UID) && inode->i_uid != iattr->ia_uid,
1413 chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid;
1414 char warntype_to[MAXQUOTAS];
1415 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1417 /* First test before acquiring mutex - solves deadlocks when we
1418 * re-enter the quota code and are already holding the mutex */
1419 if (IS_NOQUOTA(inode))
1421 /* Clear the arrays */
1422 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1423 transfer_to[cnt] = transfer_from[cnt] = NODQUOT;
1424 warntype_to[cnt] = QUOTA_NL_NOWARN;
1426 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1427 /* Now recheck reliably when holding dqptr_sem */
1428 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1429 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1432 /* First build the transfer_to list - here we can block on
1433 * reading/instantiating of dquots. We know that the transaction for
1434 * us was already started so we don't violate lock ranking here */
1435 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1440 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
1445 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
1449 spin_lock(&dq_data_lock);
1450 space = inode_get_bytes(inode);
1451 /* Build the transfer_from list and check the limits */
1452 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1453 if (transfer_to[cnt] == NODQUOT)
1455 transfer_from[cnt] = inode->i_dquot[cnt];
1456 if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
1457 NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
1458 warntype_to + cnt) == NO_QUOTA)
1463 * Finally perform the needed transfer from transfer_from to transfer_to
1465 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1467 * Skip changes for same uid or gid or for turned off quota-type.
1469 if (transfer_to[cnt] == NODQUOT)
1472 /* Due to IO error we might not have transfer_from[] structure */
1473 if (transfer_from[cnt]) {
1474 warntype_from_inodes[cnt] =
1475 info_idq_free(transfer_from[cnt], 1);
1476 warntype_from_space[cnt] =
1477 info_bdq_free(transfer_from[cnt], space);
1478 dquot_decr_inodes(transfer_from[cnt], 1);
1479 dquot_decr_space(transfer_from[cnt], space);
1482 dquot_incr_inodes(transfer_to[cnt], 1);
1483 dquot_incr_space(transfer_to[cnt], space);
1485 inode->i_dquot[cnt] = transfer_to[cnt];
1489 spin_unlock(&dq_data_lock);
1490 /* Dirtify all the dquots - this can block when journalling */
1491 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1492 if (transfer_from[cnt])
1493 mark_dquot_dirty(transfer_from[cnt]);
1494 if (transfer_to[cnt])
1495 mark_dquot_dirty(transfer_to[cnt]);
1497 flush_warnings(transfer_to, warntype_to);
1498 flush_warnings(transfer_from, warntype_from_inodes);
1499 flush_warnings(transfer_from, warntype_from_space);
1501 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1502 if (ret == QUOTA_OK && transfer_from[cnt] != NODQUOT)
1503 dqput(transfer_from[cnt]);
1504 if (ret == NO_QUOTA && transfer_to[cnt] != NODQUOT)
1505 dqput(transfer_to[cnt]);
1507 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1511 /* Wrapper for transferring ownership of an inode */
1512 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
1514 if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
1516 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
1524 * Write info of quota file to disk
1526 int dquot_commit_info(struct super_block *sb, int type)
1529 struct quota_info *dqopt = sb_dqopt(sb);
1531 mutex_lock(&dqopt->dqio_mutex);
1532 ret = dqopt->ops[type]->write_file_info(sb, type);
1533 mutex_unlock(&dqopt->dqio_mutex);
1538 * Definitions of diskquota operations.
1540 struct dquot_operations dquot_operations = {
1541 .initialize = dquot_initialize,
1543 .alloc_space = dquot_alloc_space,
1544 .alloc_inode = dquot_alloc_inode,
1545 .free_space = dquot_free_space,
1546 .free_inode = dquot_free_inode,
1547 .transfer = dquot_transfer,
1548 .write_dquot = dquot_commit,
1549 .acquire_dquot = dquot_acquire,
1550 .release_dquot = dquot_release,
1551 .mark_dirty = dquot_mark_dquot_dirty,
1552 .write_info = dquot_commit_info,
1553 .alloc_dquot = dquot_alloc,
1554 .destroy_dquot = dquot_destroy,
1558 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1560 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
1563 struct quota_info *dqopt = sb_dqopt(sb);
1564 struct inode *toputinode[MAXQUOTAS];
1566 /* Cannot turn off usage accounting without turning off limits, or
1567 * suspend quotas and simultaneously turn quotas off. */
1568 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1569 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1570 DQUOT_USAGE_ENABLED)))
1573 /* We need to serialize quota_off() for device */
1574 mutex_lock(&dqopt->dqonoff_mutex);
1577 * Skip everything if there's nothing to do. We have to do this because
1578 * sometimes we are called when fill_super() failed and calling
1579 * sync_fs() in such cases does no good.
1581 if (!sb_any_quota_loaded(sb)) {
1582 mutex_unlock(&dqopt->dqonoff_mutex);
1585 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1586 toputinode[cnt] = NULL;
1587 if (type != -1 && cnt != type)
1589 if (!sb_has_quota_loaded(sb, cnt))
1592 if (flags & DQUOT_SUSPENDED) {
1594 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1596 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1597 /* Turning off suspended quotas? */
1598 if (!sb_has_quota_loaded(sb, cnt) &&
1599 sb_has_quota_suspended(sb, cnt)) {
1600 dqopt->flags &= ~dquot_state_flag(
1601 DQUOT_SUSPENDED, cnt);
1602 iput(dqopt->files[cnt]);
1603 dqopt->files[cnt] = NULL;
1608 /* We still have to keep quota loaded? */
1609 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1612 /* Note: these are blocking operations */
1613 drop_dquot_ref(sb, cnt);
1614 invalidate_dquots(sb, cnt);
1616 * Now all dquots should be invalidated, all writes done so we should be only
1617 * users of the info. No locks needed.
1619 if (info_dirty(&dqopt->info[cnt]))
1620 sb->dq_op->write_info(sb, cnt);
1621 if (dqopt->ops[cnt]->free_file_info)
1622 dqopt->ops[cnt]->free_file_info(sb, cnt);
1623 put_quota_format(dqopt->info[cnt].dqi_format);
1625 toputinode[cnt] = dqopt->files[cnt];
1626 if (!sb_has_quota_loaded(sb, cnt))
1627 dqopt->files[cnt] = NULL;
1628 dqopt->info[cnt].dqi_flags = 0;
1629 dqopt->info[cnt].dqi_igrace = 0;
1630 dqopt->info[cnt].dqi_bgrace = 0;
1631 dqopt->ops[cnt] = NULL;
1633 mutex_unlock(&dqopt->dqonoff_mutex);
1635 /* Skip syncing and setting flags if quota files are hidden */
1636 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1639 /* Sync the superblock so that buffers with quota data are written to
1640 * disk (and so userspace sees correct data afterwards). */
1641 if (sb->s_op->sync_fs)
1642 sb->s_op->sync_fs(sb, 1);
1643 sync_blockdev(sb->s_bdev);
1644 /* Now the quota files are just ordinary files and we can set the
1645 * inode flags back. Moreover we discard the pagecache so that
1646 * userspace sees the writes we did bypassing the pagecache. We
1647 * must also discard the blockdev buffers so that we see the
1648 * changes done by userspace on the next quotaon() */
1649 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1650 if (toputinode[cnt]) {
1651 mutex_lock(&dqopt->dqonoff_mutex);
1652 /* If quota was reenabled in the meantime, we have
1654 if (!sb_has_quota_loaded(sb, cnt)) {
1655 mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA);
1656 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1657 S_NOATIME | S_NOQUOTA);
1658 truncate_inode_pages(&toputinode[cnt]->i_data, 0);
1659 mutex_unlock(&toputinode[cnt]->i_mutex);
1660 mark_inode_dirty(toputinode[cnt]);
1662 mutex_unlock(&dqopt->dqonoff_mutex);
1665 invalidate_bdev(sb->s_bdev);
1667 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1668 if (toputinode[cnt]) {
1669 /* On remount RO, we keep the inode pointer so that we
1670 * can reenable quota on the subsequent remount RW. We
1671 * have to check 'flags' variable and not use sb_has_
1672 * function because another quotaon / quotaoff could
1673 * change global state before we got here. We refuse
1674 * to suspend quotas when there is pending delete on
1675 * the quota file... */
1676 if (!(flags & DQUOT_SUSPENDED))
1677 iput(toputinode[cnt]);
1678 else if (!toputinode[cnt]->i_nlink)
1684 int vfs_quota_off(struct super_block *sb, int type, int remount)
1686 return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
1687 (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
1691 * Turn quotas on on a device
1695 * Helper function to turn quotas on when we already have the inode of
1696 * quota file and no quota information is loaded.
1698 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
1701 struct quota_format_type *fmt = find_quota_format(format_id);
1702 struct super_block *sb = inode->i_sb;
1703 struct quota_info *dqopt = sb_dqopt(sb);
1709 if (!S_ISREG(inode->i_mode)) {
1713 if (IS_RDONLY(inode)) {
1717 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
1721 /* Usage always has to be set... */
1722 if (!(flags & DQUOT_USAGE_ENABLED)) {
1727 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
1728 /* As we bypass the pagecache we must now flush the inode so
1729 * that we see all the changes from userspace... */
1730 write_inode_now(inode, 1);
1731 /* And now flush the block cache so that kernel sees the
1733 invalidate_bdev(sb->s_bdev);
1735 mutex_lock(&inode->i_mutex);
1736 mutex_lock(&dqopt->dqonoff_mutex);
1737 if (sb_has_quota_loaded(sb, type)) {
1742 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
1743 /* We don't want quota and atime on quota files (deadlocks
1744 * possible) Also nobody should write to the file - we use
1745 * special IO operations which ignore the immutable bit. */
1746 down_write(&dqopt->dqptr_sem);
1747 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
1748 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
1749 up_write(&dqopt->dqptr_sem);
1750 sb->dq_op->drop(inode);
1754 dqopt->files[type] = igrab(inode);
1755 if (!dqopt->files[type])
1758 if (!fmt->qf_ops->check_quota_file(sb, type))
1761 dqopt->ops[type] = fmt->qf_ops;
1762 dqopt->info[type].dqi_format = fmt;
1763 dqopt->info[type].dqi_fmt_id = format_id;
1764 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
1765 mutex_lock(&dqopt->dqio_mutex);
1766 if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
1767 mutex_unlock(&dqopt->dqio_mutex);
1770 mutex_unlock(&dqopt->dqio_mutex);
1771 mutex_unlock(&inode->i_mutex);
1772 dqopt->flags |= dquot_state_flag(flags, type);
1774 add_dquot_ref(sb, type);
1775 mutex_unlock(&dqopt->dqonoff_mutex);
1780 dqopt->files[type] = NULL;
1783 mutex_unlock(&dqopt->dqonoff_mutex);
1784 if (oldflags != -1) {
1785 down_write(&dqopt->dqptr_sem);
1786 /* Set the flags back (in the case of accidental quotaon()
1787 * on a wrong file we don't want to mess up the flags) */
1788 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
1789 inode->i_flags |= oldflags;
1790 up_write(&dqopt->dqptr_sem);
1792 mutex_unlock(&inode->i_mutex);
1794 put_quota_format(fmt);
1799 /* Reenable quotas on remount RW */
1800 static int vfs_quota_on_remount(struct super_block *sb, int type)
1802 struct quota_info *dqopt = sb_dqopt(sb);
1803 struct inode *inode;
1807 mutex_lock(&dqopt->dqonoff_mutex);
1808 if (!sb_has_quota_suspended(sb, type)) {
1809 mutex_unlock(&dqopt->dqonoff_mutex);
1812 inode = dqopt->files[type];
1813 dqopt->files[type] = NULL;
1814 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
1815 DQUOT_LIMITS_ENABLED, type);
1816 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
1817 mutex_unlock(&dqopt->dqonoff_mutex);
1819 flags = dquot_generic_flag(flags, type);
1820 ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
1827 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
1830 int error = security_quota_on(path->dentry);
1833 /* Quota file not on the same filesystem? */
1834 if (path->mnt->mnt_sb != sb)
1837 error = vfs_load_quota_inode(path->dentry->d_inode, type,
1838 format_id, DQUOT_USAGE_ENABLED |
1839 DQUOT_LIMITS_ENABLED);
1843 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
1850 return vfs_quota_on_remount(sb, type);
1852 error = kern_path(name, LOOKUP_FOLLOW, &path);
1854 error = vfs_quota_on_path(sb, type, format_id, &path);
1861 * More powerful function for turning on quotas allowing setting
1862 * of individual quota flags
1864 int vfs_quota_enable(struct inode *inode, int type, int format_id,
1868 struct super_block *sb = inode->i_sb;
1869 struct quota_info *dqopt = sb_dqopt(sb);
1871 /* Just unsuspend quotas? */
1872 if (flags & DQUOT_SUSPENDED)
1873 return vfs_quota_on_remount(sb, type);
1876 /* Just updating flags needed? */
1877 if (sb_has_quota_loaded(sb, type)) {
1878 mutex_lock(&dqopt->dqonoff_mutex);
1879 /* Now do a reliable test... */
1880 if (!sb_has_quota_loaded(sb, type)) {
1881 mutex_unlock(&dqopt->dqonoff_mutex);
1884 if (flags & DQUOT_USAGE_ENABLED &&
1885 sb_has_quota_usage_enabled(sb, type)) {
1889 if (flags & DQUOT_LIMITS_ENABLED &&
1890 sb_has_quota_limits_enabled(sb, type)) {
1894 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
1896 mutex_unlock(&dqopt->dqonoff_mutex);
1901 return vfs_load_quota_inode(inode, type, format_id, flags);
1905 * This function is used when filesystem needs to initialize quotas
1906 * during mount time.
1908 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
1909 int format_id, int type)
1911 struct dentry *dentry;
1914 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
1916 return PTR_ERR(dentry);
1918 if (!dentry->d_inode) {
1923 error = security_quota_on(dentry);
1925 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
1926 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
1933 /* Wrapper to turn on quotas when remounting rw */
1934 int vfs_dq_quota_on_remount(struct super_block *sb)
1939 if (!sb->s_qcop || !sb->s_qcop->quota_on)
1941 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1942 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
1943 if (err < 0 && !ret)
1949 static inline qsize_t qbtos(qsize_t blocks)
1951 return blocks << QIF_DQBLKSIZE_BITS;
1954 static inline qsize_t stoqb(qsize_t space)
1956 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
1959 /* Generic routine for getting common part of quota structure */
1960 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
1962 struct mem_dqblk *dm = &dquot->dq_dqb;
1964 spin_lock(&dq_data_lock);
1965 di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
1966 di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
1967 di->dqb_curspace = dm->dqb_curspace;
1968 di->dqb_ihardlimit = dm->dqb_ihardlimit;
1969 di->dqb_isoftlimit = dm->dqb_isoftlimit;
1970 di->dqb_curinodes = dm->dqb_curinodes;
1971 di->dqb_btime = dm->dqb_btime;
1972 di->dqb_itime = dm->dqb_itime;
1973 di->dqb_valid = QIF_ALL;
1974 spin_unlock(&dq_data_lock);
1977 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
1979 struct dquot *dquot;
1981 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
1982 if (!(dquot = dqget(sb, id, type))) {
1983 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1986 do_get_dqblk(dquot, di);
1988 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1992 /* Generic routine for setting common part of quota structure */
1993 static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
1995 struct mem_dqblk *dm = &dquot->dq_dqb;
1996 int check_blim = 0, check_ilim = 0;
1997 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1999 if ((di->dqb_valid & QIF_BLIMITS &&
2000 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
2001 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
2002 (di->dqb_valid & QIF_ILIMITS &&
2003 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
2004 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
2007 spin_lock(&dq_data_lock);
2008 if (di->dqb_valid & QIF_SPACE) {
2009 dm->dqb_curspace = di->dqb_curspace;
2012 if (di->dqb_valid & QIF_BLIMITS) {
2013 dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
2014 dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
2017 if (di->dqb_valid & QIF_INODES) {
2018 dm->dqb_curinodes = di->dqb_curinodes;
2021 if (di->dqb_valid & QIF_ILIMITS) {
2022 dm->dqb_isoftlimit = di->dqb_isoftlimit;
2023 dm->dqb_ihardlimit = di->dqb_ihardlimit;
2026 if (di->dqb_valid & QIF_BTIME)
2027 dm->dqb_btime = di->dqb_btime;
2028 if (di->dqb_valid & QIF_ITIME)
2029 dm->dqb_itime = di->dqb_itime;
2032 if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) {
2034 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2036 else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
2037 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2040 if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
2042 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2044 else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
2045 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2047 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
2048 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2050 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2051 spin_unlock(&dq_data_lock);
2052 mark_dquot_dirty(dquot);
2057 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
2059 struct dquot *dquot;
2062 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2063 dquot = dqget(sb, id, type);
2068 rc = do_set_dqblk(dquot, di);
2071 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2075 /* Generic routine for getting common part of quota file information */
2076 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2078 struct mem_dqinfo *mi;
2080 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2081 if (!sb_has_quota_active(sb, type)) {
2082 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2085 mi = sb_dqopt(sb)->info + type;
2086 spin_lock(&dq_data_lock);
2087 ii->dqi_bgrace = mi->dqi_bgrace;
2088 ii->dqi_igrace = mi->dqi_igrace;
2089 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2090 ii->dqi_valid = IIF_ALL;
2091 spin_unlock(&dq_data_lock);
2092 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2096 /* Generic routine for setting common part of quota file information */
2097 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2099 struct mem_dqinfo *mi;
2102 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2103 if (!sb_has_quota_active(sb, type)) {
2107 mi = sb_dqopt(sb)->info + type;
2108 spin_lock(&dq_data_lock);
2109 if (ii->dqi_valid & IIF_BGRACE)
2110 mi->dqi_bgrace = ii->dqi_bgrace;
2111 if (ii->dqi_valid & IIF_IGRACE)
2112 mi->dqi_igrace = ii->dqi_igrace;
2113 if (ii->dqi_valid & IIF_FLAGS)
2114 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
2115 spin_unlock(&dq_data_lock);
2116 mark_info_dirty(sb, type);
2117 /* Force write to disk */
2118 sb->dq_op->write_info(sb, type);
2120 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2124 struct quotactl_ops vfs_quotactl_ops = {
2125 .quota_on = vfs_quota_on,
2126 .quota_off = vfs_quota_off,
2127 .quota_sync = vfs_quota_sync,
2128 .get_info = vfs_get_dqinfo,
2129 .set_info = vfs_set_dqinfo,
2130 .get_dqblk = vfs_get_dqblk,
2131 .set_dqblk = vfs_set_dqblk
2134 static ctl_table fs_dqstats_table[] = {
2136 .ctl_name = FS_DQ_LOOKUPS,
2137 .procname = "lookups",
2138 .data = &dqstats.lookups,
2139 .maxlen = sizeof(int),
2141 .proc_handler = &proc_dointvec,
2144 .ctl_name = FS_DQ_DROPS,
2145 .procname = "drops",
2146 .data = &dqstats.drops,
2147 .maxlen = sizeof(int),
2149 .proc_handler = &proc_dointvec,
2152 .ctl_name = FS_DQ_READS,
2153 .procname = "reads",
2154 .data = &dqstats.reads,
2155 .maxlen = sizeof(int),
2157 .proc_handler = &proc_dointvec,
2160 .ctl_name = FS_DQ_WRITES,
2161 .procname = "writes",
2162 .data = &dqstats.writes,
2163 .maxlen = sizeof(int),
2165 .proc_handler = &proc_dointvec,
2168 .ctl_name = FS_DQ_CACHE_HITS,
2169 .procname = "cache_hits",
2170 .data = &dqstats.cache_hits,
2171 .maxlen = sizeof(int),
2173 .proc_handler = &proc_dointvec,
2176 .ctl_name = FS_DQ_ALLOCATED,
2177 .procname = "allocated_dquots",
2178 .data = &dqstats.allocated_dquots,
2179 .maxlen = sizeof(int),
2181 .proc_handler = &proc_dointvec,
2184 .ctl_name = FS_DQ_FREE,
2185 .procname = "free_dquots",
2186 .data = &dqstats.free_dquots,
2187 .maxlen = sizeof(int),
2189 .proc_handler = &proc_dointvec,
2192 .ctl_name = FS_DQ_SYNCS,
2193 .procname = "syncs",
2194 .data = &dqstats.syncs,
2195 .maxlen = sizeof(int),
2197 .proc_handler = &proc_dointvec,
2199 #ifdef CONFIG_PRINT_QUOTA_WARNING
2201 .ctl_name = FS_DQ_WARNINGS,
2202 .procname = "warnings",
2203 .data = &flag_print_warnings,
2204 .maxlen = sizeof(int),
2206 .proc_handler = &proc_dointvec,
2212 static ctl_table fs_table[] = {
2214 .ctl_name = FS_DQSTATS,
2215 .procname = "quota",
2217 .child = fs_dqstats_table,
2222 static ctl_table sys_table[] = {
2232 static int __init dquot_init(void)
2235 unsigned long nr_hash, order;
2237 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2239 register_sysctl_table(sys_table);
2241 dquot_cachep = kmem_cache_create("dquot",
2242 sizeof(struct dquot), sizeof(unsigned long) * 4,
2243 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2244 SLAB_MEM_SPREAD|SLAB_PANIC),
2248 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2250 panic("Cannot create dquot hash table");
2252 /* Find power-of-two hlist_heads which can fit into allocation */
2253 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2257 } while (nr_hash >> dq_hash_bits);
2260 nr_hash = 1UL << dq_hash_bits;
2261 dq_hash_mask = nr_hash - 1;
2262 for (i = 0; i < nr_hash; i++)
2263 INIT_HLIST_HEAD(dquot_hash + i);
2265 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2266 nr_hash, order, (PAGE_SIZE << order));
2268 register_shrinker(&dqcache_shrinker);
2270 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2271 if (genl_register_family("a_genl_family) != 0)
2272 printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n");
2277 module_init(dquot_init);
2279 EXPORT_SYMBOL(register_quota_format);
2280 EXPORT_SYMBOL(unregister_quota_format);
2281 EXPORT_SYMBOL(dqstats);
2282 EXPORT_SYMBOL(dq_data_lock);
2283 EXPORT_SYMBOL(vfs_quota_enable);
2284 EXPORT_SYMBOL(vfs_quota_on);
2285 EXPORT_SYMBOL(vfs_quota_on_path);
2286 EXPORT_SYMBOL(vfs_quota_on_mount);
2287 EXPORT_SYMBOL(vfs_quota_disable);
2288 EXPORT_SYMBOL(vfs_quota_off);
2289 EXPORT_SYMBOL(vfs_quota_sync);
2290 EXPORT_SYMBOL(vfs_get_dqinfo);
2291 EXPORT_SYMBOL(vfs_set_dqinfo);
2292 EXPORT_SYMBOL(vfs_get_dqblk);
2293 EXPORT_SYMBOL(vfs_set_dqblk);
2294 EXPORT_SYMBOL(dquot_commit);
2295 EXPORT_SYMBOL(dquot_commit_info);
2296 EXPORT_SYMBOL(dquot_acquire);
2297 EXPORT_SYMBOL(dquot_release);
2298 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
2299 EXPORT_SYMBOL(dquot_initialize);
2300 EXPORT_SYMBOL(dquot_drop);
2301 EXPORT_SYMBOL(vfs_dq_drop);
2302 EXPORT_SYMBOL(dquot_alloc_space);
2303 EXPORT_SYMBOL(dquot_alloc_inode);
2304 EXPORT_SYMBOL(dquot_free_space);
2305 EXPORT_SYMBOL(dquot_free_inode);
2306 EXPORT_SYMBOL(dquot_transfer);
2307 EXPORT_SYMBOL(vfs_dq_transfer);
2308 EXPORT_SYMBOL(vfs_dq_quota_on_remount);